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Experimental Study of Oily Wastewater Treatment by Hybrid Baffled Bioreactor

Zolfaghari, Mehdi | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40962 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Alemzadeh, Iran; Vosoughi, Manochehr
  7. Abstract:
  8. Oil refineries, petrochemical factories and oil platforms produce a large amount of oily wastewater every day. If these wastewaters are released in environment, it can damage soil and water seriously. Although, Biological treatment of oily wastewaters is a well-established method for remediation of these wastes, efficiency of conventional systems such as Activated Sludge, aren’t very high. Also these systems have many problems such as instability during hydraulics shocks and bulking phenomena. the hybrid bioreactor system are designed to increase the efficiency of treatment by allowing greater organic loads, increasing microbial concentration by using attached and suspended bacteria, and increasing stability and resistance to hydraulic and organic shocks. In this study a hybrid and an activated sludge reactor, which have 34 and 6.5 liter capacity respectively, are used to treat synthetic high CODs oily wastewater. Novel media used in this fixed-film bioreactor for first time, provides a high surface area-to-volume ratio (600 m2/m3) in the reactor. Reactor Biodegradability for COD (Chemical Oxygen Demand) and TPH (Total Petroleum Hydrocarbon) is evaluated for different Hydraulic Retention Time and oil pollution concentration. The best COD and TPH removal efficiency in TPH= 100 mg.L-1 and HRT= 48 hr is reported 96 and 100 percent respectively. Also, optimized performance in HRT= 24 hr, TPH= 300 mg.L-1, COD= 750 mg.L-1, is reported 81 percent and 93 percent for COD and TPH removal in T= 27ºC and pH= 7.5. Existing Conventional Activate Sludge plants can be upgraded by changing the reactor configuration and introducing support media into aeration tank.

  9. Keywords:
  10. Biofilm Reactors ; Oily Wastewater ; Activated Sludge Reactor ; Chemical Oxygen Demand (COD)Removal Ratio ; Hybrid Baffled Reactor ; Total Petroleume Hydrocarbon (TPH)Removal

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